Navien NP-180 Service Manual page 88

Check method
Error type
Air supply / exhaust
10E occurs
close program is
intermittently
changed.
Air pressure
hose error,
venturi clogged
Air pressure
sensor error
Defective heat
exchanger
Condensed
water drain
error
< Check if the venturi is clogged.>
Condensed
Condensed water
water drain
drain error
error
Air pressure
Defective blower
error
©Navien America Inc. 2010
Cause
1. If 10E occurs intermittently during ignition or combustion,
compare the stan-dard RPM (o.000) with the current RPM (r.000)
at Min / Max combustion(dip switch 1-1&2). If the current RPM is
near the excessive air pressure condition, check the follows:
Air supply / exhaust
Drainage of condensed water
If the air pressure hose is broken or clogged.
2. Replace the old controller with a new one (change the program).
1. The air pressure hose is clogged.
Check if the hose is clogged with water remained from installation.
2. Check if the venturi (burner) hole is clogged with soot or foreign
substance.
Blow air with mouth through the air pressure hose.
3. Check if the air pressure hose is torn.
Increased RPM may cause blowout and noise.
03E can occur due to the same trouble.
The air pressure sensor error occurs due to heat leaked from the
heat exchanger.
Check if the error occurs continuously after the air volume sensor is
replaced.
After 5 min from the start of the boiler, put your hand near the air
pressure sensor, and check if you can feel the heat.
Exhaust air is locked out due to condensed water drain error.
Check if the condensed water hose or the siphon is frozen.
Check if the condensed water hose is folded.
Remove bottom of trap and verify it is not plugged
1. Replace the blower if the blower RPM is considerably low.
2. Check the blower rpm displayed on the controller. (r.320 3200 rpm)
NR/NP series service Manual
Check method
< Defective air pressure hose >
86
Version 2.0